US PATENT SUBCLASS 405 / 254
.~.~.~ Longitudinally ribbed

Current as of: June, 1999
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405 /   HD   HYDRAULIC AND EARTH ENGINEERING

229  DF  FOUNDATION {2}
231  DF  .~ Columnar structure (e.g., pier, pile) {7}
253  DF  .~.~ With driving or cutting tip {1}
254.~.~.~ Longitudinally ribbed

DEFINITION

Classification: 405/254

Longitudinally ribbed:

(under subclass 253) Method or apparatus wherein the elongated member or driving tip is provided with a protruding ridge along its length or a portion thereof.